Initial import

1 files changed, 184 insertions, 0 deletions

diff --git a/drivers/usb/serial/aircable.c b/drivers/usb/serial/aircable.c
new file mode 100644
index 000000000..80a9845cd
--- /dev/null
+++ b/drivers/usb/serial/aircable.c
@@ -0,0 +1,184 @@
+/*
+ * AIRcable USB Bluetooth Dongle Driver.
+ *
+ * Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
+ * Copyright (C) 2006 Manuel Francisco Naranjo (naranjo.manuel@gmail.com)
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ *
+ * The device works as an standard CDC device, it has 2 interfaces, the first
+ * one is for firmware access and the second is the serial one.
+ * The protocol is very simply, there are two possibilities reading or writing.
+ * When writing the first urb must have a Header that starts with 0x20 0x29 the
+ * next two bytes must say how much data will be sent.
+ * When reading the process is almost equal except that the header starts with
+ * 0x00 0x20.
+ *
+ * The device simply need some stuff to understand data coming from the usb
+ * buffer: The First and Second byte is used for a Header, the Third and Fourth
+ * tells the  device the amount of information the package holds.
+ * Packages are 60 bytes long Header Stuff.
+ * When writing to the device the first two bytes of the header are 0x20 0x29
+ * When reading the bytes are 0x00 0x20, or 0x00 0x10, there is an strange
+ * situation, when too much data arrives to the device because it sends the data
+ * but with out the header. I will use a simply hack to override this situation,
+ * if there is data coming that does not contain any header, then that is data
+ * that must go directly to the tty, as there is no documentation about if there
+ * is any other control code, I will simply check for the first
+ * one.
+ *
+ * The driver registers himself with the USB-serial core and the USB Core. I had
+ * to implement a probe function against USB-serial, because other way, the
+ * driver was attaching himself to both interfaces. I have tried with different
+ * configurations of usb_serial_driver with out exit, only the probe function
+ * could handle this correctly.
+ *
+ * I have taken some info from a Greg Kroah-Hartman article:
+ * http://www.linuxjournal.com/article/6573
+ * And from Linux Device Driver Kit CD, which is a great work, the authors taken
+ * the work to recompile lots of information an knowledge in drivers development
+ * and made it all available inside a cd.
+ * URL: http://kernel.org/pub/linux/kernel/people/gregkh/ddk/
+ *
+ */
+
+#include <asm/unaligned.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/tty_flip.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+/* Vendor and Product ID */
+#define AIRCABLE_VID		0x16CA
+#define AIRCABLE_USB_PID	0x1502
+
+/* Protocol Stuff */
+#define HCI_HEADER_LENGTH	0x4
+#define TX_HEADER_0		0x20
+#define TX_HEADER_1		0x29
+#define RX_HEADER_0		0x00
+#define RX_HEADER_1		0x20
+#define HCI_COMPLETE_FRAME	64
+
+/* rx_flags */
+#define THROTTLED		0x01
+#define ACTUALLY_THROTTLED	0x02
+
+#define DRIVER_AUTHOR "Naranjo, Manuel Francisco <naranjo.manuel@gmail.com>, Johan Hovold <jhovold@gmail.com>"
+#define DRIVER_DESC "AIRcable USB Driver"
+
+/* ID table that will be registered with USB core */
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE(AIRCABLE_VID, AIRCABLE_USB_PID) },
+	{ },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static int aircable_prepare_write_buffer(struct usb_serial_port *port,
+						void *dest, size_t size)
+{
+	int count;
+	unsigned char *buf = dest;
+
+	count = kfifo_out_locked(&port->write_fifo, buf + HCI_HEADER_LENGTH,
+					size - HCI_HEADER_LENGTH, &port->lock);
+	buf[0] = TX_HEADER_0;
+	buf[1] = TX_HEADER_1;
+	put_unaligned_le16(count, &buf[2]);
+
+	return count + HCI_HEADER_LENGTH;
+}
+
+static int aircable_probe(struct usb_serial *serial,
+			  const struct usb_device_id *id)
+{
+	struct usb_host_interface *iface_desc = serial->interface->
+								cur_altsetting;
+	struct usb_endpoint_descriptor *endpoint;
+	int num_bulk_out = 0;
+	int i;
+
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
+		endpoint = &iface_desc->endpoint[i].desc;
+		if (usb_endpoint_is_bulk_out(endpoint)) {
+			dev_dbg(&serial->dev->dev,
+				"found bulk out on endpoint %d\n", i);
+			++num_bulk_out;
+		}
+	}
+
+	if (num_bulk_out == 0) {
+		dev_dbg(&serial->dev->dev, "Invalid interface, discarding\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int aircable_process_packet(struct usb_serial_port *port,
+		int has_headers, char *packet, int len)
+{
+	if (has_headers) {
+		len -= HCI_HEADER_LENGTH;
+		packet += HCI_HEADER_LENGTH;
+	}
+	if (len <= 0) {
+		dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
+		return 0;
+	}
+
+	tty_insert_flip_string(&port->port, packet, len);
+
+	return len;
+}
+
+static void aircable_process_read_urb(struct urb *urb)
+{
+	struct usb_serial_port *port = urb->context;
+	char *data = (char *)urb->transfer_buffer;
+	int has_headers;
+	int count;
+	int len;
+	int i;
+
+	has_headers = (urb->actual_length > 2 && data[0] == RX_HEADER_0);
+
+	count = 0;
+	for (i = 0; i < urb->actual_length; i += HCI_COMPLETE_FRAME) {
+		len = min_t(int, urb->actual_length - i, HCI_COMPLETE_FRAME);
+		count += aircable_process_packet(port, has_headers,
+								&data[i], len);
+	}
+
+	if (count)
+		tty_flip_buffer_push(&port->port);
+}
+
+static struct usb_serial_driver aircable_device = {
+	.driver = {
+		.owner =	THIS_MODULE,
+		.name =		"aircable",
+	},
+	.id_table = 		id_table,
+	.num_ports =		1,
+	.bulk_out_size =	HCI_COMPLETE_FRAME,
+	.probe =		aircable_probe,
+	.process_read_urb =	aircable_process_read_urb,
+	.prepare_write_buffer =	aircable_prepare_write_buffer,
+	.throttle =		usb_serial_generic_throttle,
+	.unthrottle =		usb_serial_generic_unthrottle,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+	&aircable_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");